score:7
On is the biblical Hebrew name of Heliopolis. Potipherah is only mentioned in Genesis 41:45 (your passage) and 41:50:
And unto Joseph were born two sons before the year of famine came, whom Asenath the daughter of Poti-phera priest of On bore unto him
His rank ("governor/priest of On") and the literal meaning of his name ("he whom Ra has given") imply he might have been a High Priest of Ra.